MP Select Mini X Gantry Support Bearing Holder Adjusted

An adjusted version of the bearing holder for user *FDM_Guru's* X Gantry Support System for the Monoprice MP Select Mini. This version puts the holder (and hence the shaft) 1.5mm further from the gantry (away from the edge of the printer). I found this was required to get the shaft to align with the hole in the bolt-over side panel.

Also, a small cap to fit over the top end of the shaft, for safety.